Electric elevator system.



E. M. FRASER. ELECTRIC ELIEVATOKSYSTEM. APPLICATION FILED AUG.25.1914.

1,237,32 1 Patented Aug. 21, 1917.

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/7/ M A TURN 5 Y3 UNITED STATES PATENT OFFICE.

ETHELBERT M. FRASER, F YONKEBS, NEW YORK, ASSIGNOR TO GENERAL ELEVATOR COMPANY, OF JERSEY CITY, NEW JERSEY, A CORPORATION OF NEW JERSEY.

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1 237 321 Specification of Letters Patent. Patented Aug, 21, 1917', Application filed August 25, 1914. Serial No. 858,442. To all whom it may concern: rections the reverse of each other when the Be it known that I, Errrnnnnn'r M. FRASER, system is in operation. a citizen of the Dominion of Canada, resid- The objects of my invention will appear ing at Yonkers, county of Westchester, and from the drawings and the detailed descrip- 5 State of New York, have invented a new tion to follow. so and useful Improvement in Electric Ele- A referred form of an electric elevator vator Systems, of which the following is a or hoisting system embodying my invention specification. is illustrated in the accompanying drawing My invention relates to an electric eleforming a part of this specification, in vator system or hoisting apparatus, of the which 65 traction type, comprising two electric ma Figure 1 is a view partly in section of the chines, each having two rotors, one of which two electric machines, each machine com rotors includes an armature and the other a prising an outer rotor or field structure and field, said rotors being so connected that an inner rotor or armature, the armatures when operated one rotor of one machine will being suitably geared together so as to ro- 70 rotate in the same direction as one of the tate in opposite directions, the outer rotors rotors of the other machine, and the other or field structures carrying power-transtwo rotors will rotate in directions the remission members or sheaves.

verse of each other. In other words, when Fig. 2'is a view illustrating diagrammatithe system or apparatus is being operated cally the combination of the two driving 75 three of the rotors will rotate in the same sheaves of the two electric machines with direction, while the fourth rotor will roelevator car or hoist-and the counterweight, tate in a direction the reverse of the other and the power-transmission means connectthree. Such a system is not only shown ing the car and counterweight with the two i herein but also in reissued United States machines. In this view the armatures are '80 Letters Patent No. 13,806, granted to me on illustrated as being geared together so as to October 13th, 191 1, for an electric elevator rotate in directions the reverse of each other. system. Fig. 3 is a wiring diagram.

As shown and described herein, my im- Referring to the drawings, the two elecproved electric elevator system or hoisting tric machines 1 and 2, which are preferably apparatus comprises two electric machines, of the shunt-wound type, constitute a moeach having two rotors magnetically and tor-generator set. Machine 1 comprises an electrically cooperating with each other and outer rotor or field structure 3 and an inner providing an armature and a field structure, rotor or armature t, and machine 2 com- 35 one of the rotors of one machine beingxsuit prises an outer rotor or field structure 5 ably geared or connected to one of t e roand an inner rotor or armature 6. Each mators of the other machine so that said rotors chine is also provided with a commutator 7. will always rotate in directions the reverse Armature i is provided with a shaft 8 of each other, and the other rotors will which is rotatably journaled in the stand- 4 through the medium of suitable power-transards 9, 10. Armature 6 is also provided mission means rotate in the same direction. with a shaft 11 which is rotatably journaled In such a system or apparatus if the outer in the standards 12,13. The two armatures rotors include the field magnets, they are so 4, 6 are mechanically connected together by arranged and constructed that they can romeans of a spur gear 14:, secured to the ar- 5 tate in either direction, and the inner romature shaft 8, and the spur gear 15 secured tors which include the armatures are meto the armature shaft 11, these two gears 14 chanically connected together by suitable and 15 meshing with each other so that the gearing so as to always rotate in directions armatures 4: and 6 will always rotate in dithe reverse of each other. In such arrangerections the reverse of each other.

50 ments it is to be understood that one rotor The field structure 3 is rotatably mounted of each machine preferably carries or drives upon the standards 9 and 10 by means of a power-transmission member and that these the spider or end-bell 16, and the spider or two rotors rotate intermittently while the end-bell 17, and the field structure 5 is roother two rotors of said machines which are tatably mounted upon the standards 12 and 55 geared together continuously rotate in di- 13 by means of e spider or end-bell 18 and the spider or end-bell 19. With this 2. An electric elevator system comprising construction the armatures 4, 6 must rotate two electric machines each having two rotors in directions the reverse of each other and ma netically and electrically cooperating the field structures 3, are rotatable in either with each other and providing an armature 5 direction. The spider or end-bell 17 is prefand a field structure, one-actor of one maerably provided with a pulley or sheave 20, chino being mechanically connected to a rowhich 15 suitably provided with grooved tor of the other machine so that the two roportions 21; and :the spider or end-bell 19 tors will continuously rotate in directions is preferably provided with a pulleyor v,the reverse of, each other, and the other rosheave 22 which is suitably provided With tors will rotate intermittentl in the same 75 grooved port ns 23. The pulleys .orsheaves direction relative to each other. 20 and 22 wit their grooved portions 2l and 3. ,An electric. elevator system comprising 23, respectively, I are .vppw er transrriission two electric machines, each having an inner members enclare adaptedto drive suitable and outer rotor, thei nner rotors being coupower-transinission means connected to the P d qg tllero o t at they Will continuously 3 car and v.coiniter eigl t. The poWer-transrotate in directions the re verse of each other,

to the elevator car or hoist and the other set of endsto the. eonnterweight 26. These blnation witha car, 0t twoelectric machines, oisting ropes or, cables 24, 24 constitute a each having inner and outer rotors, the roset of flexible connectors between the car, tors of eath machinemagnetically and elect e counterweight and the electric machines. tricelly cooperat ng with each other and 25 The fiexibleconnectors 24 so engage the providing an armature and field structure, so sheaves 20, 23 thatthefield structures 3 and ,t-he inner rotor of one machine being me- 5 will intermittently rotate in the same dichanica y n ct d v ,th i e otor 01" rection relative to' each other when the car thepther machine so that the two inner rois beingraised or lowered, ItWill. also be tol'smust rotatein directions the reversepf observed .th at when the ,syste ,is'iii opera each, ther, th ou qt ng-m ch n- 95 will continuiically connected to the car.

onsly rotate .in directions the, reverse -of I 1 n ele tric elevator system, the com- .binatipnwith two electric inachlnes, each Beferring-to Fig. 3 the field magnetsof haying aninner andanouter rotor providthe machinesor motors l nd 2 are electriing. .electri 0fl1 1y; and magn tica y oooperat 10o call'y connected up series. and connected mgfield and armature, one of the rotors of power mains .27, 28v and one Inachine being connected by gearing t0 the armatures 4; and 6 are; in multiple and one of the rotors of the other machine so connected acrossthe line. ;The system herethat ,the two rotors, Wlll. rotate 1n. directions 40 in shown and described is also. to be pro- .t e reverse of each other and the other rovided with the lusual armature starting rheotors of the two machines ,Wlll. rotate in ,the stat 29, a suitable-fixed resjstance30 in the .saniedirectionflas each other, and means for field circuits, and aplainfield rheostat 31 controlling the speed and rotat on of the tq vary the field strength of either mptorin t-mentipned rotors.

5 the same manner as shown. in my reissued I 6. Iran electric elevator system, the com- 1 PatentNo. 13,806. The field rheostat3l is bination with two electric machines, each preferably laced in the car 25. V

W l a h e i which the outer rotors include the fieldmagarmatures being c upled t g her So that so nets'and the inner rotors include the armathey ,will rptatein directions the reverse of tures it is obvious that the outer rotors may each other and the field structures will rocpnstitute the armatures' while t'he inner tate in the same vdirection relative to each rotors would include the field magnets. other.

[Having thus described my invention, what 7. In an elevator system, the combination 55 I claim as new and desire to secure by Letof two electric machines,,.each having aroters Eatenhis: tatable armature and a rotatable field strucl.',An electric elevator systemcomprising ture encircling said armature, said arma- 60 chanically connected to, a .rotor of the other ot ier, and power-transmission members carwill rotate intermittently in the same direcelectric machines each having a rotatable 65 tion relative to each other. armature and a rotatable field, structure encircling said armature, said armatures being mechanically connected together so that they will rotate in directions the reverse of each other, and means for transmitting the reactions between the mechanically connected armatures and their respective cooperating field structures to move said car.

9. In an electric elevator system, the combination with two electric machines each having a rotatable armature and a rotatable field structure encircling said armature, said armatures being mechanically connected together so that they will continuously rotate in directions the reverse of each other, means for controlling the speed and rotation of said field structures, and a flexible connector driven by each of said field structures.

10. In an electric elevator system, the combination with two electric machines, each having a rotatable armature and a rotatable field structure encircling said armature, said armatures being mechanically connected together so that they will continuously rotate in directions the reverse of each other, or a pulley driven by each of said field structures, a flexible connector engaging each of said pulleys, and means for varyin the field strength of either or both of sai machines.

11. In an electric elevator system, the combination with a car, of a counterweight, two electric machines having rotatable field structures and rotatable armatures, said armatures being mechanically connected toble connector connected at one end to said car and passin over the pulley driven by the other said eld structure and connected at its other end to said counterweight.

In Witness whereof I sign this specification in the presence of two witnesses.

ETHELBERT M. FRASER. Witnesses:

WM. E. HUBBARD, NATHAN Nu'r'rme;

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, I). C." 

